NDLI: A formulation of rotor-airframe coupling for design analysis of vibrations of helicopter airframes

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A formulation of rotor-airframe coupling for design analysis of vibrations of helicopter airframes

Content Provider	NASA Technical Reports Server (NTRS)
Author	Walton Jr., W. C. Kvaternik, R. G.
Copyright Year	1982
Description	A linear formulation of rotor airframe coupling intended for vibration analysis in airframe structural design is presented. The airframe is represented by a finite element analysis model; the rotor is represented by a general set of linear differential equations with periodic coefficients; and the connections between the rotor and airframe are specified through general linear equations of constraint. Coupling equations are applied to the rotor and airframe equations to produce one set of linear differential equations governing vibrations of the combined rotor airframe system. These equations are solved by the harmonic balance method for the system steady state vibrations. A feature of the solution process is the representation of the airframe in terms of forced responses calculated at the rotor harmonics of interest. A method based on matrix partitioning is worked out for quick recalculations of vibrations in design studies when only relatively few airframe members are varied. All relations are presented in forms suitable for direct computer implementation.
File Size	7412411
Page Count	139
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19840025761
Archival Resource Key	ark:/13960/t0sr3q423
Language	English
Publisher Date	1982-06-01
Access Restriction	Open
Subject Keyword	Structural Mechanics Finite Element Method Numerical Analysis Vibration Airframes Engine Airframe Integration Mathematical Models Harmonic Motion Rotary Wing Aircraft Coupling Mechanical Drives Helicopter Design Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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